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Very Simple Gamepad HID Descriptor
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| //simple_gamepad_hid.h | |
| #define REPORT_BYTE_LENGTH 4 // (8 + 16 + 8) / 8 | |
| char ReportDescriptor[44] = { | |
| 0x05, 0x01, // USAGE_PAGE (Generic Desktop) | |
| 0x09, 0x05, // USAGE (Game Pad) | |
| 0xa1, 0x01, // COLLECTION (Application) | |
| 0xa1, 0x00, // COLLECTION (Physical) | |
| // ReportID - 8 bits | |
| 0x85, 0x01, // REPORT_ID (1) | |
| // X & Y - 2x8 = 16 bits | |
| 0x05, 0x01, // USAGE_PAGE (Generic Desktop) | |
| 0x09, 0x30, // USAGE (X) | |
| 0x09, 0x31, // USAGE (Y) | |
| 0x15, 0x81, // LOGICAL_MINIMUM (-127) | |
| 0x25, 0x7f, // LOGICAL_MAXIMUM (127) | |
| 0x75, 0x08, // REPORT_SIZE (8) | |
| 0x95, 0x02, // REPORT_COUNT (2) | |
| 0x81, 0x02, // INPUT (Data,Var,Abs) | |
| // Buttons - 8 bits | |
| 0x05, 0x09, // USAGE_PAGE (Button) | |
| 0x19, 0x01, // USAGE_MINIMUM (Button 1) | |
| 0x29, 0x08, // USAGE_MAXIMUM (Button 8) | |
| 0x15, 0x00, // LOGICAL_MINIMUM (0) | |
| 0x25, 0x01, // LOGICAL_MAXIMUM (1) | |
| 0x75, 0x08, // REPORT_SIZE (8) | |
| 0x95, 0x01, // REPORT_COUNT (1) | |
| 0x81, 0x02, // INPUT (Data,Var,Abs) | |
| 0xc0, // END_COLLECTION | |
| 0xc0 // END_COLLECTION | |
| }; |
How do you make the Joystick X & Y axes output floating point values?
Your description has the minimum and maximum values at: -128 and 127. However, most games are expecting -1.00 to 1.00.
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0x15, 0x81, // LOGICAL_MINIMUM (-127)better:
0x15, 0x80, // LOGICAL_MINIMUM (-128)